:root {
  --bg: #f5f7fb;
  --bg-soft: #ffffff;
  --panel: rgba(255,255,255,0.82);
  --panel-strong: rgba(255,255,255,0.95);
  --line: #e6ecf5;
  --line-strong: #d6e0ee;
  --text: #0f172a;
  --text-soft: #334155;
  --muted: #64748b;
  --muted-2: #94a3b8;
  --primary: #2563eb;
  --primary-2: #1d4ed8;
  --accent: #7c3aed;
  --success: #16a34a;
  --warn: #f59e0b;
  --shadow-xs: 0 8px 24px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 14px 36px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 24px 56px rgba(15, 23, 42, 0.10);
  --shadow-lg: 0 32px 90px rgba(37, 99, 235, 0.12);
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --container: 1200px;
  --page-bg:
    radial-gradient(circle at top left, rgba(37,99,235,0.08), transparent 22%),
    radial-gradient(circle at top right, rgba(124,58,237,0.06), transparent 20%),
    linear-gradient(180deg, #f8fbff 0%, #f3f7fd 100%);
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #101a2f;
  --panel: rgba(17, 26, 46, 0.72);
  --panel-strong: rgba(16, 24, 39, 0.94);
  --line: rgba(255,255,255,0.10);
  --line-strong: rgba(255,255,255,0.16);
  --text: #f8fbff;
  --text-soft: #d9e2f1;
  --muted: #9fb0c7;
  --muted-2: #7f90a7;
  --primary: #4f8cff;
  --primary-2: #2563eb;
  --accent: #a855f7;
  --success: #22c55e;
  --warn: #fbbf24;
  --shadow-xs: 0 8px 24px rgba(0, 0, 0, 0.22);
  --shadow-sm: 0 14px 36px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 24px 56px rgba(0, 0, 0, 0.34);
  --shadow-lg: 0 32px 90px rgba(37, 99, 235, 0.18);
  --page-bg:
    radial-gradient(circle at top left, rgba(79,140,255,0.16), transparent 22%),
    radial-gradient(circle at top right, rgba(168,85,247,0.10), transparent 20%),
    linear-gradient(180deg, #0b1220 0%, #0d172b 100%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Arial, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--text);
  background: var(--page-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
img { max-width: 100%; display: block; }
.container { width: min(calc(100% - 32px), var(--container)); margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg-soft) 76%, transparent);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo-wrap { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 14px;
  display: grid; place-items: center; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 12px 30px rgba(37,99,235,0.25);
  font-weight: 900;
}
.logo-text strong { display: block; font-size: 18px; letter-spacing: -0.03em; }
.logo-text span { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }
.header-right { display: flex; align-items: center; gap: 14px; }
.top-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.top-nav a {
  padding: 10px 14px; border-radius: 999px; font-size: 14px; font-weight: 700;
  color: var(--muted); transition: .2s ease;
}
.top-nav a:hover, .top-nav a.active { color: var(--text); background: var(--panel); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.theme-toggle, .menu-toggle {
  min-height: 42px; border: 1px solid var(--line); background: var(--panel);
  color: var(--text); border-radius: 12px; padding: 0 14px; font-weight: 800; cursor: pointer;
  box-shadow: var(--shadow-xs);
}
.menu-toggle { display: none; }

.mobile-sheet {
  display: none; position: fixed; inset: 76px 12px auto; z-index: 50;
  background: var(--panel-strong); border: 1px solid var(--line); border-radius: 24px;
  padding: 14px; box-shadow: var(--shadow-md);
}
.mobile-sheet.open { display: block; }
.mobile-sheet a {
  display: block; padding: 14px 12px; border-radius: 14px; font-weight: 700; color: var(--text-soft);
}
.mobile-sheet a + a { margin-top: 6px; }
.mobile-sheet a:hover { background: var(--panel); }

.notice-strip {
  padding: 14px 0 0;
}
.notice-strip-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px 16px; border: 1px solid var(--line); background: var(--panel);
  border-radius: 18px; box-shadow: var(--shadow-xs);
}
.notice-strip strong { font-size: 14px; }
.notice-strip span { color: var(--muted); font-size: 13px; }
.notice-links { display: flex; gap: 8px; flex-wrap: wrap; }
.notice-links a {
  min-height: 34px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; font-size: 12px; font-weight: 800;
}

.hero {
  padding: 30px 0 24px;
}
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr); gap: 20px;
}
.hero-main, .hero-side, .surface {
  border: 1px solid var(--line); border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  box-shadow: var(--shadow-lg);
}
.hero-main {
  padding: 34px;
  position: relative;
  overflow: hidden;
}
.hero-main::after {
  content: ""; position: absolute; right: -60px; top: -70px; width: 220px; height: 220px;
  border-radius: 999px; background: radial-gradient(circle, rgba(37,99,235,0.18) 0%, rgba(37,99,235,0) 70%);
}
.eyebrow {
  display: inline-flex; min-height: 34px; align-items: center; justify-content: center;
  border-radius: 999px; padding: 0 12px; font-size: 12px; font-weight: 800;
  background: rgba(37,99,235,0.10); color: var(--primary); border: 1px solid rgba(37,99,235,0.18);
}
.hero h1 {
  margin: 16px 0 14px; font-size: clamp(40px, 6vw, 68px); line-height: .96; letter-spacing: -0.06em;
}
.hero p.lead {
  max-width: 700px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.75;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.btn {
  min-height: 52px; padding: 0 18px; border-radius: 16px; font-weight: 800; display: inline-flex;
  align-items: center; justify-content: center; border: 1px solid transparent; transition: .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-2)); box-shadow: 0 16px 32px rgba(37,99,235,0.22); }
.btn.secondary { background: var(--bg-soft); border-color: var(--line); color: var(--text); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--text-soft); }
.hero-points {
  margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px;
}
.point-chip {
  min-height: 38px; padding: 0 14px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--bg-soft) 85%, transparent); border: 1px solid var(--line); font-size: 13px; font-weight: 700; color: var(--text-soft);
}
.hero-side {
  padding: 22px; display: grid; gap: 14px; align-content: start;
}
.kpi-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px;
}
.kpi-card, .mini-card, .tool-card, .feature-card, .ad-card, .guide-card, .faq-card, .tool-surface, .side-card {
  border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-soft) 92%, transparent); box-shadow: var(--shadow-xs);
}
.kpi-card {
  border-radius: 20px; padding: 18px;
}
.kpi-card strong { display: block; font-size: 26px; letter-spacing: -0.04em; }
.kpi-card span { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.hero-side .ad-card { min-height: 148px; }
.ad-card {
  border-radius: 24px; padding: 18px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, rgba(37,99,235,0.07), rgba(124,58,237,0.06));
}
.ad-label {
  display: inline-flex; min-height: 28px; align-items: center; justify-content: center;
  padding: 0 10px; border-radius: 999px; font-size: 11px; font-weight: 900; letter-spacing: .04em; text-transform: uppercase;
  color: var(--primary); background: rgba(37,99,235,0.08); border: 1px solid rgba(37,99,235,0.14);
}
.ad-card h3 { margin: 14px 0 8px; font-size: 20px; letter-spacing: -0.03em; }
.ad-card p { margin: 0; color: var(--muted); line-height: 1.65; font-size: 14px; }
.ad-card .ad-slot {
  margin-top: 14px; min-height: 78px; border-radius: 18px; border: 1px dashed var(--line-strong);
  display: grid; place-items: center; color: var(--muted-2); font-size: 13px;
  background: color-mix(in srgb, var(--bg-soft) 86%, transparent);
}

.tools-home { padding: 10px 0 26px; }
.section-head {
  display: flex; justify-content: space-between; align-items: end; gap: 14px; margin-bottom: 18px;
}
.section-head h2 {
  margin: 10px 0 8px; font-size: clamp(28px, 4vw, 42px); line-height: 1.04; letter-spacing: -0.05em;
}
.section-head p { margin: 0; max-width: 680px; color: var(--muted); line-height: 1.7; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  min-height: 34px; padding: 0 12px; border-radius: 999px; background: var(--panel); border: 1px solid var(--line); font-size: 12px; font-weight: 800; color: var(--text-soft);
}
.tools-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px;
}
.tool-card {
  border-radius: 24px; padding: 22px; transition: .22s ease; position: relative; overflow: hidden;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--primary) 35%, var(--line)); }
.tool-card .tool-top {
  display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 16px;
}
.tool-badge {
  min-height: 34px; padding: 0 12px; border-radius: 999px; font-size: 12px; font-weight: 900;
  display: inline-flex; align-items: center; justify-content: center; background: rgba(37,99,235,0.08); color: var(--primary);
}
.tool-icon {
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 14px;
  background: linear-gradient(135deg, rgba(37,99,235,0.14), rgba(124,58,237,0.14)); font-size: 18px;
}
.tool-card h3 { margin: 0 0 8px; font-size: 22px; letter-spacing: -0.04em; }
.tool-card p { margin: 0; color: var(--muted); line-height: 1.7; font-size: 14px; min-height: 72px; }
.tool-meta { margin-top: 16px; display: flex; justify-content: space-between; gap: 10px; align-items: center; font-size: 13px; color: var(--muted); }
.tool-meta strong { color: var(--text); }

.use-cases, .trust-row, .faq-home { padding: 8px 0 30px; }
.card-grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.feature-card, .guide-card, .faq-card { border-radius: 24px; padding: 22px; }
.feature-card h3, .guide-card h3, .faq-card h3 { margin: 0 0 10px; font-size: 20px; letter-spacing: -0.03em; }
.feature-card p, .guide-card p, .faq-card p { margin: 0; color: var(--muted); line-height: 1.7; font-size: 14px; }
.trust-band {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px;
}
.mini-card { border-radius: 22px; padding: 18px; }
.mini-card strong { display: block; font-size: 15px; }
.mini-card span { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.site-footer { padding: 10px 0 40px; }
.footer-card {
  border: 1px solid var(--line); background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  border-radius: 28px; padding: 24px; box-shadow: var(--shadow-sm);
  display: flex; justify-content: space-between; gap: 20px; align-items: center; flex-wrap: wrap;
}
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }

/* Tool page */
.tool-shell { padding: 28px 0 36px; }
.tool-hero {
  margin-bottom: 18px;
}
.tool-hero-card {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr); gap: 16px;
  border: 1px solid var(--line); border-radius: 32px; padding: 26px; background: linear-gradient(180deg, var(--panel-strong), var(--panel)); box-shadow: var(--shadow-md);
}
.tool-copy h1 { margin: 14px 0 10px; font-size: clamp(34px, 5vw, 54px); line-height: .98; letter-spacing: -0.05em; }
.tool-copy p { margin: 0; color: var(--muted); line-height: 1.75; font-size: 16px; max-width: 760px; }
.tool-copy .hero-actions { margin-top: 20px; }
.tool-summary {
  display: grid; gap: 12px;
}
.summary-card {
  border-radius: 22px; padding: 18px; border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-soft) 94%, transparent);
}
.summary-card strong { display: block; font-size: 15px; margin-bottom: 6px; }
.summary-card span { color: var(--muted); font-size: 13px; line-height: 1.55; }

.workspace {
  display: grid; grid-template-columns: minmax(0, 1.38fr) minmax(280px, 0.62fr); gap: 18px;
}
.tool-surface {
  border-radius: 30px; padding: 22px; background: linear-gradient(180deg, var(--panel-strong), var(--panel));
}
.drop-zone {
  padding: 34px 20px; border-radius: 26px; text-align: center; border: 2px dashed color-mix(in srgb, var(--primary) 30%, var(--line));
  background: linear-gradient(135deg, rgba(37,99,235,0.05), rgba(124,58,237,0.05)); transition: .2s ease;
}
.drop-zone:hover, .drop-zone.is-dragover {
  transform: translateY(-1px); border-color: color-mix(in srgb, var(--primary) 60%, var(--line));
  box-shadow: 0 0 0 5px rgba(37,99,235,0.06);
}
.drop-icon {
  width: 68px; height: 68px; margin: 0 auto 14px; border-radius: 22px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-size: 28px; box-shadow: 0 18px 32px rgba(37,99,235,0.18);
}
.drop-zone h2 { margin: 0 0 8px; font-size: clamp(26px, 3vw, 36px); letter-spacing: -0.04em; }
.drop-zone p { margin: 0 0 18px; color: var(--muted); line-height: 1.65; }
.file-button {
  min-height: 50px; padding: 0 18px; border-radius: 16px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--text); color: var(--bg-soft); font-weight: 900; cursor: pointer;
}
:root[data-theme="dark"] .file-button { background: #fff; color: #0f172a; }
.toolbar {
  margin-top: 16px; display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding: 16px; border: 1px solid var(--line); border-radius: 22px; background: color-mix(in srgb, var(--bg-soft) 95%, transparent);
}
.toolbar-info { color: var(--muted); font-weight: 700; }
.toolbar-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.toolbar-btn {
  min-height: 46px; border-radius: 14px; padding: 0 16px; border: 1px solid transparent; font-weight: 900; cursor: pointer; transition: .2s ease;
}
.toolbar-btn:hover { transform: translateY(-1px); }
.toolbar-btn.primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; }
.toolbar-btn.secondary { background: var(--bg-soft); color: var(--text); border-color: var(--line); }
.toolbar-btn.success { background: linear-gradient(135deg, var(--success), #15803d); color: #fff; }
.progress-panel {
  margin-top: 16px; padding: 16px; border-radius: 22px; border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-soft) 96%, transparent);
}
.progress-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.progress-top strong { font-size: 14px; }
.progress-top span { color: var(--muted); font-size: 13px; font-weight: 700; }
.progress-bar { height: 10px; border-radius: 999px; background: color-mix(in srgb, var(--text) 8%, transparent); overflow: hidden; }
.progress-fill { height: 100%; width: 42%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.controls-grid {
  margin-top: 16px; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px;
}
.control-card {
  padding: 18px; border-radius: 22px; border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-soft) 95%, transparent);
}
.control-label { display: block; margin-bottom: 12px; font-size: 14px; font-weight: 900; }
.quality-range { width: 100%; }
.control-meta { margin-top: 8px; display: flex; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--muted); }
.radio-row { display: flex; gap: 8px; flex-wrap: wrap; }
.radio-chip {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
}
.radio-chip input { position: absolute; opacity: 0; pointer-events: none; }
.radio-chip span {
  min-height: 40px; padding: 0 14px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; border: 1px solid var(--line); background: var(--bg-soft); color: var(--text-soft); font-size: 13px; font-weight: 800; cursor: pointer;
}
.radio-chip input:checked + span { background: rgba(37,99,235,0.1); color: var(--primary); border-color: rgba(37,99,235,0.24); }
.preview-grid {
  margin-top: 16px; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px;
}
.preview-card {
  border: 1px solid var(--line); border-radius: 24px; overflow: hidden; background: color-mix(in srgb, var(--bg-soft) 96%, transparent);
}
.preview-card .label { padding: 14px 16px; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 900; }
.preview-body { aspect-ratio: 16/11; display: grid; place-items: center; color: var(--muted); background: linear-gradient(180deg, transparent, rgba(37,99,235,0.03)); }
.stats-row { display: flex; gap: 8px; flex-wrap: wrap; padding: 14px 16px; border-top: 1px solid var(--line); }
.stat-pill { min-height: 34px; padding: 0 12px; border-radius: 999px; background: var(--panel); border: 1px solid var(--line); font-size: 12px; font-weight: 800; color: var(--text-soft); }
.side-stack { display: grid; gap: 14px; }
.side-card { padding: 20px; border-radius: 24px; }
.side-card h3 { margin: 0 0 12px; font-size: 18px; letter-spacing: -0.03em; }
.side-card p { margin: 0; color: var(--muted); line-height: 1.68; font-size: 14px; }
.side-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.side-list li {
  display: flex; justify-content: space-between; gap: 12px; font-size: 14px; color: var(--muted);
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.side-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.side-list strong { color: var(--text); }
.link-list { display: grid; gap: 10px; }
.link-list a {
  padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line); background: var(--bg-soft); font-weight: 800;
}
.sticky-bar {
  position: sticky; bottom: 14px; margin-top: 18px; padding: 14px; border-radius: 22px; border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 92%, transparent); backdrop-filter: blur(14px); box-shadow: var(--shadow-md);
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
}
.sticky-bar strong { display: block; font-size: 15px; }
.sticky-bar span { display: block; color: var(--muted); font-size: 13px; margin-top: 4px; }
.sticky-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.reco-strip { margin-top: 18px; }
.reco-strip h2 { margin: 0 0 12px; font-size: 24px; letter-spacing: -0.03em; }
.reco-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.reco-card { padding: 18px; border-radius: 22px; border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-soft) 95%, transparent); }
.reco-card h3 { margin: 0 0 8px; font-size: 18px; }
.reco-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }

@media (max-width: 1100px) {
  .hero-grid, .tool-hero-card, .workspace, .tools-grid, .card-grid-3, .trust-band, .reco-grid { grid-template-columns: 1fr 1fr; }
  .workspace { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .top-nav, .header-actions .btn-header-hide { display: none; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .hero-grid, .tool-hero-card, .tools-grid, .card-grid-3, .trust-band, .preview-grid, .controls-grid, .reco-grid { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .hero-main, .hero-side, .tool-hero-card, .tool-surface { padding: 22px; }
}
@media (max-width: 640px) {
  .container { width: min(calc(100% - 24px), var(--container)); }
  .header-inner { min-height: 68px; }
  .notice-strip-inner, .toolbar, .sticky-bar, .footer-card { align-items: stretch; }
  .hero { padding-top: 20px; }
  .hero h1 { font-size: clamp(34px, 12vw, 54px); }
  .btn, .toolbar-btn, .theme-toggle, .menu-toggle, .file-button { width: 100%; }
  .hero-actions, .toolbar-actions, .sticky-actions { flex-direction: column; }
  .notice-strip-inner { flex-direction: column; }
  .kpi-grid { grid-template-columns: 1fr; }
}